Insulator.



OHAUNCEY 'C. JOHNSON, OF

HUNDREDTHS TO .IOHN

SCRANTON, PENNSYLVANIA, ASSIGNOR OF FORTY-EIVE om:-

A. WATSON, or PITTSTON, PENNSYLVANIA.

INSULATOB.

' Specification of Letters Patent.

Patented May 26, 1.908.

,Applicationfiled October 26, 1907. Serial No, 399,377;

Tozall whom it my concern:

I Be it known that I, CHAUNCEY- C, JOH SON a; citizen of the UnitedStates residing at-Scranton, in the county ofLacka'wanna and State ofPennsylvania, have invented'a" newand useful Insulator, of which thefollowing is a specification. Y

This inventionrelates to insulatorsfor the support of telegraph,telephone, and other wires, and has for its principal object toprovide-a .nov'el'iorln of insulator that is; so-

mounted and arranged as to firmly grip and holdithe wire in case thelatter "becomesbroken between any two insulators, so that thewire willnot-pull looseand sag, so asto bring it into contact with'lower wires,and render restretching and repairs difiicult.

r A further obj ect ofthe invention is .to pro-' vide afpivotallymounted insulator-that is arranged tolbe turned on its pivot understress of the wire when the latter is broken beyond the insulator. 1f Astill further ob'jeo't of the invention is to provide a ivotally mountedinsulator that willfirmly old a line-wire and into which the wire may beintroduced without the necessity of ernploying'tying links or otherauxiliary tasten ngs.

provide-a singlepiece insulator of such constructlon-as to permit theready attaching of wires of-difierent gage.

With' these and other-objects in view, as

will 'rhore fully hereinafter appear, the in vention consistsin-eertain. novel features of construction and arrangement of parts,hereinafter hilly described, illustrated in the accompanying; drawings,

proportions, .sizeand minor details of the: structure may be madewithout departing from the spirit or sacrificing. any of the ad-.vantages of the invention.

l isla perspective view of-an insulator constructed in. accordance wlththe invention.-

vFig. 2-isavertioa'l section of the same.- Fig.

3 is a plan view of the insulator in normal position. Fig. 4 is'asimilar view, showing the insulator. ulled partly around under thestrain oz": a bro lren wire. 3 y

Simil a1" numerals of reference areemployed to indicate correspondingparts throughout theseveral figures of the drawings.

.stiil further objeotof the inventionis m 7 and particularly pointed outin the appended clairris, it beingunderstood thatvarious, changes in theform,-

I-n-the' accompanying -drawings:*Figure I The insulator is formed ofglass or other suitablernaterial, and isprovided'with the usualihreadedopening 10 and petticoat 11,

and the opening unthreaded, the insulator being so mounted on the pinthat it is free to turn in-either direction under'stress of the .wirewhen the latter is broken. Theoentral portion of the top of theinsulator is slightly convexed, and is provided with a diametricallydisposed 'rib 12, the opposite ends of which are arranged onslight ycurved lines,

. form arounded jaw for engagement with one side of the wire, and thisrounded jaw coacts with a concaved jaw. 15 that is formedint'egral withthe body of the insulator and extends upward at a po'int'slightly beyondthe end-of the rib. The width of the jaw 1-5 is much greater than thatof'the rib 12 and the inner face of the end portions of said jaw 15areprovided with notches18 and 19, which are arranged to receive thewire, these niayieceive a wire of heavy gage, while the lowermost' notchor notches atthe' base of the jaws rnayrecei've a. wire of lighter gage.At the opposite s'ide'is a similar jaw 15 having a notch 20 thatpreferably isof greater depththanthe note -18.for the purpose ofreceiving a lar ewir'e. The top 0 the rib 12 projects slight y above theupper. faces of the jaws 15,1 15, and when alwire is'to be introducedinto the tapering spaces between said jaws, it is slightly' bent tocorrespond to the arcuate faces of the -jaws, nd then is. forced set ofnotches. In every. case the depth of the notches is slightly bent aroundthe end ofthe rib and in. this manner will" be clamped and held a ainstlongitudinal as well as upward dis- P 94061116315, j

The insulator forming the subject of the present invention isdesigned'foruse in con-' nection with a single who only, the wire beingplacedatone or other'side of theinsulator'in accordance with its gageand-so long. [as the wire remains unbroken and is subjected topractically the same tensional strain the wire, but if the although insome cases the pinmaybe smooth notchesbelng of different depth and thenpperrnost notch 18 being largest, so that 1t 'downward'until it springsinto one 'or other such. thatthe wire will be.

1 onop'posite sides of. the insulator, the length. of the rib'1-2- willbe-ap roxi-mately'at a rightand the rib is convex in cross section so asto reshould-become broken between two inno sulotors, or between theinsuliitor t't-nd another attaching point, the wire at the opposite sidewill act to turn the insulator on its supporting in, and in so doing thewire will be bent at t at point Whete it posses beyond the edge of theJZLW 15, and the double bend thus formed inside and outside the jaw 15will serve to firmly clamp the Wire in piece and prevent its, fallingintoocontact Wlth eubjecent Wires, The extent to which the insulator isturned will depend on the stress of the wire, and the greater the stressand extent of turning, the greater the binding effect of the ineulateron the wire.

A. pivotellj mounted insulator having at the top it treneverseiyextending rib convex in cross eeotion and curved outwardly and wires ofdifferent gage.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two Witnesses.

CHAUNCEY C. JOHNSON; Witnesses:

JAB. M. WALKER, W. J. DILLON.

